Dr. Jekyll, Gentleman

Whenever another creature dies, you and target opponent both investigate. (Each of you create a colorless Clue artifact token with "{2}, Sacrifice this artifact: Draw a card.")
{u}{u}: Dr. Jekyll gains hexproof until end of turn. Transform Dr. Jekyll.
"Some day, Utterson, after I am dead, you may perhaps come to learn the right and wrong of this. I cannot tell you."